Align form builder home screen with the prototype

[DavidBiddle]

What problem does the pull request solve?

Closes #42

I've added a basic overview page so that I have something to point to - currently I'm using the show view for this and the edit view for what will probably eventually be the edit title page, I'm sure we'll want to change this eventually but i think it works for now.

I'm not entirely convinced the cypress tests I've written are adding much at the moment - I'm open to suggestions on better things to test here, but these will at least be enough to work with in our CI pipeline (see #46).

• Update form home screen create button to match the prototype
• Update form list display to match the prototype
  • Note: In Dev we can keep the link to the runner for now as a link underneath the form name or something similar
• Edit links take you to the form overview screen (depends on Create initial form overview screen #43 )
• Create request and frontend specs for this

Checklist

• I've used the pull request template
• I've linked this PR to the relevant issue (if mission work)
• I've written unit tests for these changes (if code change)
• [n/a] I've updated the documentation in (If any documentation requires updating)

[danielburnley]

Not sure if the line i commented on is intentionally left in, but seems good! Feel free to delete that line and merge if need be

It might be worth creating an issue for running the cypress tests in the pipeline and we can grab it at some point soon (I'm happy to try if you're unsure how to do it), but it can be separate to this PR